Apple Resources - Network Tools
http://edu-observatory.org/olli/Manage/Network.html

Network Analysis Tools 
  http://edu-observatory.org/olli/HCS/tools.html   
Connectivity (Internet) 
  http://edu-observatory.org/olli/Manage/Connectivity.html   
WiFi Connectivity 
  http://edu-observatory.org/olli/Manage/WiFi_Connectivity.html   

Creating and Maintaining Home Networks 
  http://edu-observatory.org/olli/Networks/index.html   
Network Quality (Apple)
  https://tidbits.com/2022/04/22/use-apples-networkquality-tool-to-test-internet-responsiveness/   

HE.NET Network Tools
  https://apps.apple.com/us/app/he-net-network-tools/id858241710 



DNS - Public DNS service operators
  https://en.m.wikipedia.org/wiki/Public_recursive_name_server#List_of_public_DNS_service_operators
  https://1.1.1.1
  https://www.dnsperf.com/#!dns-resolvers
  
  A public Domain Name Server (DNS) is a name server that may
  be used in place of, or in addition to, name servers
  provided by your local Internet Service Provider (ISP).
  Public name servers offer reliability, security, speed and
  privacy. Several services now support secure DNS lookup
  transport services such as DNS over TLS and DNS over HTTPS.

TCP and UDP ports used by Apple software products
  https://support.apple.com/en-us/HT202944   
  https://support.apple.com/en-us/HT210060   


     
  
  

 
    sam.wormley@icloud.com